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Note 13 - Commitments and Contingencies Legal Proceedings (Details)
6 Months Ended
Jun. 30, 2018
matter
Apr. 12, 2018
Certificates
Jun. 05, 2017
Certificates
Dec. 17, 2016
Certificates
Unasserted Claim [Member] | Minimum [Member]        
Loss Contingencies [Line Items]        
Minimum Number of Pending or Threatened Matters That Could Affect Our Results | matter 1      
Total Primary Insurance Mortgage Insurance Products [Member] | Insurance Claims [Member]        
Loss Contingencies [Line Items]        
Loss Contingency, Legal Actions Commencement, Period 2 years      
Pool Insurance Mortgage Insurance Product [Member] | Insurance Claims [Member]        
Loss Contingencies [Line Items]        
Loss Contingency, Legal Actions Commencement, Period 3 years      
Initial [Member]        
Loss Contingencies [Line Items]        
Insurance Certificates Issued Under Multiple Insurance Policies       9,420
Ocwen Filings [Member]        
Loss Contingencies [Line Items]        
Insurance Certificates Issued Under Multiple Insurance Policies     8,870  
Subsequent Event [Member] | Ocwen Filings [Member]        
Loss Contingencies [Line Items]        
Insurance Certificates Whose Scopes Were Narrowed as a Result of the Confidential Agreement   2,500